If you want drop bars, you will most likely need;
Stem ($30 on up), standard road bar clamping diameter is 26mm, mtb bar clamping dia is 25.4
Bars and bar wrap ($30 on up)
Brake levers
Shifters
cables and housings.

I know Dia Comp makes brake levers for drop bars that work with V-brakes, the 287-V (~$60). If you use the Dia Comp V-brake levers and bar-end shifters(~$60), you don't need travel agents. The Dew frame has cable stop braze-ons on the down-tube so down tube shifters aren't very practical for your frame.

As far as I know, there are no brifters (brake lever/shifter combo) that will work with V-brakes. To use brifters (Shimano Sora 3x8 ~$160/set) you will need the travel agents(~$35/pair).

So, figure about $200 if you buy new stuff, or you can probably do it for a lot cheaper if you know what to buy and shop ebay and craigslist.